Synchronous telegraver system



" c. F. WATTS SYNCHRONOUS TELEGRAVER SYSTEM Nov. 26; 1935.

' Filed April 19, 1952 2 Sheets-Sheet 1 (ac/L F. "WAT-r5 AWNEQXK 3.

MM Mme/13 Nov. 26, 1935.. Q -rs SYNCHRONOUS TELEGRAVER SYSTEM Filed April 19, 1952 2 Shets-Sheet 2 Bnventor CECIL E WATTS (Ittomegs 55 quires it.-,.

Patented Nov; 26, 1935 UNITED STATES PATENT, OFFICE smonaonons rnmoaavnn srs'rnm can Francis Watts, Fl Application April 19, [932, Serial No. 606,190

4 Claims. (01. 17 8-69.5) I

ture transmitting system the tracer on the sending mechanism is moved step by step radially and -intermittently over the disk to describe a series of concentric contacting circles over conducting and non conducting spots formed by the lines of the image on the transmitter disk, or by halfmitted is shaded.

In the receiving apparatus, the receiver disk is intended to be rotated in exact synchronism with the disk of the sending apparatus. In ac-- tual practice, however, it has been found that passes through a position corresponding to the 30 stopiposition of the'receiving disk; This means that the twodis'ks startrotation simultaneously at the completion of. eachrevolution of the transmitting disk. I

rotation of the transmitting disk, and repetition 40 of this lead in the receiving disk produces a cumulative. lead in the received picture and causes distortion. If the disks of the two machines were set to rotate as nearly aspossible in exact synchronism, it is quite likely that there would be less. relative lag or lead between the two disks in a hundred revolutions-than that deiiberately'set up to ensure a positive lead in the It is the main object or the present invention to eliminate this distortionwhether deliberate or accidental; and,;to ensure co-operatihg control between the sending and receiving disks so that v eithermay correct the out of step rotation of the other whenever the lag or lead-of either retone screeningwhere the picture to be' trans-' l The objection to this method is that it pro duces a distortion in-the transmitted image." The deliberate speeding up of rotation of the re- While the invention is particularly described herein inconnection w th a rotating disk system, suchas described in my said application, it is to be understood that itis not to be considered as limited to the particular mechanism illustrated herein. The invention is designed to synchronize the movements of any two rotatable bodies regardless of whether they be in the form of rotating disks or rotating drums on which the trans-. mission and reception is eifected.

In the present application, the invention is shown as embodying an apparatus in which a tracing tool in the sender controls a graving tool in the receiver.. It is contemplated, however, that this invention shall also be used in connection with any optical picture transmitting system, since it involves substantially the same modeof; operation insofar as synchronization of the rotation of the transmitting and, receiving members are concerned. The description and drawings herein are merely intended to illustrate the broad inventive idea and are not intended to be in any way limited to the particular form of apparatus shown.

This'invention also has'for itsobject the addition to'the apparatus shown insaid applica tion of mechanism whereby the image trans mitted may be reproduced either enlarged .or re-' duced'on the receiver.

- Other objects of the invention will become a parent as the detailed description thereof proceeds.

In the drawings: Figure l is a diagrammatic layout of parts of the apparatus disclosed in my said co-pending ap- 3'5 plication with the'synchronizing apparatus forming the present invention added thereto; and

Figure 2 is a diagrammatic layout of the syn- 1 chronizlng mechanism adapted'foruse with simiof transmission. v As shown in Figure 1, the invention is' illustrated as applied to picture transmitting apparatus designated generally by the reference character T,

lar telegravure apparatus over a duplex system 40 andreceiving apparatus designated generally by the reference character R. The mechanism for operating the transmitter isexactly the same as that for operating the receiver. In the transmitting mechanism, a disk I is suitably supported for rotation about a vertical shaft 2 having a friction disk I connected thereto. A motor 4 supplied from the mains 5 and i has a friction pinion i secured to its rotor shaft 8. Thepinionlisindriving contact with the friction disk 3 and serves to rotate the disk I at In the res5 disk 3' secured thereto, a motor 4', supplied through the mains 5' and 6, has a rotor shaft 1" provided at its end with a friction pinion 8 which.

rotates in contact with the friction disk 3 to impart rotation to the disk I'. The driving mechanism in both sender and receiver is intendedto rotate the disks I and I' at exactly the same speed.

Suitably supported above, the disk I is a feed screw 9 which intermittently moves a sending device I0 lengthwise thereof. The sending device II) includes a tracer II designed to move in a direction over disk I, and in contact therewith, parallel to the axis of the screw 9 during the rotation of ,the disk- I; thereby tracing a series of concentric circles on the disk I or on any picture I2 suitably secured to said disk I. To efiect this intermittent movement, the friction disk 3 is provided on its periphery with a projecting lug I3 which,

. at each'complete revolution of the.shaft.2 and the disk I carried thereby, wipes against a spring contact Ii to close a circuit to the motor I5 deriving its energy also from the mains 5 and 6.

In each closing of the switch I4 the motor operates a ratchet linkage designated generally by the reference character L, and pulls down the rod I6 of said linkage into contact with one or the other of the arms I1 or I8 of a stop member rotatably mounted on a suitably supported bracket I3. The angle of rotation of the screw 9 at the endof each revolution of disk I, is therefore controlled as to magnitude in accordance with the stop positions of the arms I1 or I8. Variation in this angular movement necessalrily'causes correspondingvariations in the movements of the tracer-and receiving mechanism lengthwise of the screws 3 and I.

As fully described in-my said application, this movement, step by step, is designed to move' the tracer II so as to trace out a series of contacting concentric circles on the sending disk I. This arrangement therefore, insures a positive contact with each conducting or non-conducting spot on the picture I2 to be transmitted.

The receiver mechanism supporting the graving tool is operated in exactly the same manner as the corresponding mechanism of the transmitter and the several parts thereof are designated -by the same numerals primed. Of course, when it is desired to receive pictures-on the same scale as the picture on the transmitting disk, it is neces-' sary to arrange the appropriate stop arm'I1' or I8" in the receiver to eifect this result. Where the image is reproduced onan enlarged scale, the contact of the concentric circles on the reproducing plate may be secured by making the graying tool of suflicient width. For example, if the reproducing tool be moved three times as far as the tracer at each revolution of thedisk the contacting effect would be secured by making the end of the tool three times as wide as the end of the tracer.

Referring now to the transmitter disk I, there is shown on the edge of said disk a conducting lug I9 adapted to wipe against an electrical contact 20 at the same instant as the lug I3 closes the switch I4. An armature 2I is pivoted to the supporting mechanism of the transmitter and is held normally against a stop 22 by means of an adjustable spring 23, so that its end lies in the path of the said conducting lug III. The end of this armature clears the periphery of the disk I and merely lies in the path of movement of the conducting lug I 3.

apparatus includes the conducting armature 31 contact 33 of the transmission line. the armature 31 makes contact with contact 33 15 The disk, as usual in devices of this character, is of conducting material. The picture sending circuit starts with a contact 24 on the end of switch controlled line 35 connected to battery 26 which is connected by a wire 21 to terminal of a 5 magnet 28.

The other terminal of magnet 28 is connected by a wire 29 to the feed screw 9 which is electrically connected to the tracer II. The picture circuit completed or interrupted when the switch 30 is closed in accordance with whether or 10 not the point of the tracer II is on a conducting I or non-conducting spot of the image plate I2. The magnet 28 forms part of a polarized relay designated generally by the reference character P.

The other magnet 3I of the relay P is connected 15 of contact with the terminal 38- of the picture transmission wire 39. The wire 39 is connected through a battery 40 to a wire 4| connected to one terminal of an electro-magnet 42 having its 2' other terminal connected by wire 43 through switch 44 wire 45 switch 46 and wire 41 to the armature 31.

An electro-magnet 43 is arranged adjacent the stop armature 2I to raise the latter when it be- 30 comes necessary to .move said armature out of the stop position relative to the stop lug I3. One terminal of, the magnet 48 is connected by a wire 43 to the other contact 50 of the polarized relay P; and the other terminal of the magnet 43 is 35 connected by a wire iI to'the line 39. This completes the synchronizing wiring of the transmission apparatus.

The picture receiving circuit in the receiving 40 which is connected at its pivoted end by a wire 52 to theline wire M in advance of the magnet 42 of the polarized relay P. This picture reproducing circuit is completed by wire 53, battery 54, wire 55, terminal 53, plate 51, electro-mag- 45 nets 8 and 59, plate 51, terminal 60, wire 3I, and contact 62. It will be obvious from inspection of the drawings that every time electro-' magnet 28 of the relay P in the transmitter is energized the electro-magnet 42 of the receiver relay-P will also be energized and will pull the armature 31 into contact with the contact 62 and 64 connected by a wire 65 to the conducting disk I' by a wiping contact 33. The other terminal of the magnet 64 is connected by a wire 31 through a battery 38 and wire 63 to a wiping spring contact 10 arranged in the path of movement of the conducting stop I3. The-stop armature 2 I is adapted to be raised against th tension of the spring 23' by energization o the. electro-magnet 1|. The magnet H is connected by a wire 12 to the relay contact 13 and by a wire 65 "to the return line 44 of the transmission line. This completes the wiring of the synchronizing system in the receiving apparatus.

In operation: with the various switches closed the passage of the tracer II over the conducting 70 I and non-conducting spots of the image I2 cakises the electro-magnet 23 to move the armature 31 of the relay P into intermittent contact with the Every time transmission and receiving circuits the current for the magnets 36 and 64- shall be strong enough to pull the armatures 37 and 37' away from the contacts 3% and 62, respectively, even when current is circulating in the main transmission line.

With'this understanding, then, it becomes. evi-.

dent that when the stop contact 99' is against the end of the armature 2!, the disk l is prevented from rotation and the armature 31 has been pulled over into contact with the contact 73 even when current is circulating through magnet 42. Since the circuit including the armature 31- and contact 62 is now broken the spring mechanism of the receiving tool holds the.

tool 63 up from the receiving plate i2.

While the armature 31' is being held against the contact '13 and the disk I is stopped, the transmitting disk is still in rotationclockwise toward the end of the armature 2i, and the .magn'et 28 is being intermittently energized by the movement of the tracer H over the conducting and non-conducting spots. This intermittent energization of the magnet 28 causes inter mittent closing of the circuit through the transmission line and magnet 42 and'also causes the intermittent. flow of current, by means of the by-pass wire 52,. armature 31', contact. 13 and wire 12 through magnet ii and wires it and M to the armature 31'. However, the tension of the spring 23 is adjusted so as to prevent raising of the stop armature 2! by these intermittent impulses. It is only when the conducting stop is on the transmitting disk i contacts with the end oi the armature El and with the wiping contact 29 that current of suiiicientstrength-flows through both magnets 58 and ltfor simultaneously raising the armatures 2E and 2!, thereby permitting both disks to resume simultaneously their synchronous rotation.

As previously stated, the intermittent current due to the intermittent swings of the armature 3?, while the disk l was rotating instop It toward contact with the wiping contact iii, is insuflicient to energize the magnet ii for the purpose of freeing the receiving disk. However, just as soon as contact is made between the contacts l9 and 2!? the circuit energizing the electro-magnet Si is completed through the wires 32, 33, battery it, wire 35'and contact 38 to the edge of the disk l. Immediately upon completion of this circuit the armature 31 is pulled over and held in contact against'the contact 50 thereby effecting a continuous closed circuit through the main transmission line and magnets 38 and M sufiicient to raise the armatures 2i and it simultaneously to -release the disks 8 and i.

It will be obvious that the operation is precisely the same when the sending disk arrives at stop position ahead of the receiving disk.

Therefore, there is an infer-control between the two systems which absolutely assuresthe controi of each disk by the other. In the case of a break down in the line; or a break in the main circuit,

it is also clear that both disks will continue their.

rotation to stop position and can only be started control of the system.

The form of the invention shown in Figure 2 of the drawings is designed for use in duplex systems. In this form the sending and receiving disks l5 and F6 are designed to be. rotated at the same speed by any suitable mechanism such as disclosed in Figure l of'the drawings; The sending or transmitting device is provided with the usual tracer H which moves intermittently at each complete rotation of the disk to trace out the usual series of contacting concentric circles. The graver 18 in the receiving instrument is likewise moved radially and intermittently at each complete rotation of the receiving disk to describe a similar series of contacting concentric circles. On the transmitting disk 15, theimage plate 19 is suitably fixed and is provided with an insulating radial control segment 80 adapted to contact with the point 8! of the tracer l! at the same instant as a conducting stop 82 on the disk 15 makes wiping contact with a spring contact 83 adjacent the periphery of the disk 15 and spaced apart therefrom just enough to make good electrical contact with the stop contact 82 every time-the disk 55 completes a rotation.

The sending circuit includes a wire 8i connected electrically at one end of the tracer Ti and at its other end to a local station LS where the circuit is completed suitably through the receiving station and receiver to wire 85, battery 86, and wire 8! and contact 88 of the periphery I of the conducting disk 15.

At the transmitting station an armature 89 has one end pivotal ly supported, while the other end is held against a stop 98 by means of an adjustable spring 9!. The free end of the armature 89 is bent so as to'be drawn toward the periphery of the disk 15 by energization'of the electro-magnet 92. Normally, the free end of the armature 89 is spaced fromthe periphery of the disk so as to clear the conducting stop 82 as it rotates past the end of said armature. The

magnet 92 has one of its terminals connected by nected by a wire It! to the pivot point of a.

double throw. switch Hi2 normally contacting with a contact H33 at the end of a wire Hit also connected to the receiving station RS. Itis understood, of course, that the circuit between the wires 97 and it will be completed through the apparatus of the receiving station.

, At the receiving station, an armature i5 is pivotally supported and has its free end held by an adjustable'spring Hi6 with its free end close to the-periphery of the receiving disk 76. The disk 18 on its periphery has anon-conducting stop projection lfi'i' adapted,as the disk'lli rotates, to move under the free end of the double throw at any instant that the 4 switch I02-, and shift said switch from contact I03 against contact which is connected to one terminal of the electro-magnet IIO; the other end of said magnet being connected by a tap wire I I I to'the wire I04. In the receiving apparatus the-armature I05 is held normally in the path of rotation of the stop I01. Upon energization oi the magnet IIO, which can only happen when the double throw switch I02 is moved by contact I01 to energize the magnet I I0, the armature I05 is raised from contact with the periphery of the disk to permit rotation again of the said disk 18.

The insulating segment shown on the image transmission plate 19 is of suflici'entwidth, even in its narrowest part, to insure the tracer point 8| making contact with that insulating segment jection I01 on the receiving plate 16 shall have moved the double throw switch I02 from contact I03 to contact I09. In the normal operation of this form of the invention,'the picture have moved the double throw transmission is effected through the tracer 11, wire 84, local station tion RS, wire I04, contact I03, switch I02, wire IOI, magnet I00, wire 99, battery 98, wire 91, receiving stationRS, wire 95, local station LS, wire 85, battery 86, wire 81 and contact 88. It will be evident that every impulse transmitted from the transmitter will be repeated by the tool 88 in the receiving apparatus.

Assuming now that the receiving disk has moved slightly ahead of the transmitting disk 18 so that the insulating contact lug I01 shall contact I03 against contact, I09 it is evident under this condition that no current is being transmitted from the transmitter disk to the receiver and that the disk 16 is prevented from further'rotation by contact of the endof the armature I05 with the stop I01. It will also be evident that under this condition of affairs the two magnets I00 and I I0-'ar e in series and derive their energization through the tap wire III, instead of directly through the contact I03. slight period preceding the movement oi; the tracing point from the edge of the triangular segment to the radial line bisecting the same, the conductingcontact 82 will have moved directly under the spring contact 83. Just as soon as this contact made thecircuit through the magnet 92 is closed to pull the armature 89 into I the path of movement of the stop 82 and thereby to stop the disk 15.

The'circuit through this-magnet 92 then infcludes the contact 83, wire 94, magnet 92, wire 93, wire 84, local station LS, wire 98, receiving station RS, wire I04, wire III, magnet IIO, wire I09, contact I08, switch I02, wire IOI, magnet I00, wire 99, battery 98, wire 91, receiving station RS, wire 95, local station LS, wire 85, battery 88, wire 81, contact 88, through the conducting disk 15 and conducting stop 82 to contact. 83. This impulse immediately energizes the magnet H0. and pulls the armature I05 out of the path of movement of the stop I01 to permit the disk 16 to start rotation again. Just as soon as the stop I01 moves from under the switch I02, the switch falls back from contact I08 to contact I03. During'this momentary break or movement of the switch I02, the circuit through the magnet 92 in the transmitting station is broken,. and the spring 9| immediately pulls the I08 at the endof a wire I09,

non-conducting pro- LS, wire 95, receiver staswitch I02 from During this I armature 89 out of the: path of the conducting stop 82 so that the disk 15 follows instantaneously after the disk 16. The inter-control between the transmitting and receiving mechanisms of the system will be obvious to persons skilled in the art without further description.

While -I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the patent statutes, it should be understood that I do not limit my invention thereto, since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

What I claim is:

1. In an electrical transmission system, a transmitting disk of conducting material rotatably mounted and having an insulating segment arranged in a predetermined position thereon, a conducting lug projecting from the periphery of said disk in predetermined relation to said segment, a receiving disk of conducting material rotatably mounted and having an insulating lug projecting from the periphery thereof and in ably mounted and having an insulating segment arranged in a predetermined position thereon,

a conducting lug projecting from the periphery of said diskin predetermined relation to said seg-. ment,. a receiving disk of conducting material rotatably mounted and having an insulating lug projecting from the periphery thereof and in fixed relation to the insulating segment of the transmitting disk, stops mounted to move into,

the paths of movement of said lugs, and means controlled by simultaneous contact with said lugs to move said stops out of said paths.

3. In an electrical transmission system, a transmitting member of conducting material rotatably mounted and having an insulating section arranged in a predetermined position thereon, a conducting lug projecting from the periphery of said member in predetermined relation to said segment, a'receiving member of conducting material rotatably mounted and having an insulating lug projecting from the periphery thereof and in fixed relation to the insulating section of the transmitting member, means for rotating said members at the same speed, and means operable by. contact with said lugs to correct the lag of either member relative to the other.

4. In an electrical transmission system, a

transmitting member of conducting material ro- L tatablyv mounted and having an insulating section arranged in a predeterminedposition thereon, a conducting lug projecting from the periphcry of said member in predetermined relation to said segment, a receiving member of conducting material rotatabiy mounted and having an insulating lug projecting from the periphery'thereof and in fixed relation to the insulating section of the transmitting member, stops mounted to move into the paths of movement of said lugs, and means controlled by simultaneous contact with said lugs to move said stops onto! said paths.' 2

' CECIL FRANCIS WA'IIS. 

